Question:medium
A 27-year-old individual presents with chronic lower back pain that improves with physical activity and is associated with early morning stiffness. There is a past history of anterior uveitis. A recent X-ray of the sacroiliac joints appears normal. What is the most appropriate next step in evaluation?
A 27-year-old individual presents with chronic lower back pain that improves with physical activity and is associated with early morning stiffness. There is a past history of anterior uveitis. A recent X-ray of the sacroiliac joints appears normal. What is the most appropriate next step in evaluation?
Show Hint
Early axial spondyloarthritis with normal X-ray = do MRI sacroiliac joints.
Updated On: May 14, 2026
- MRI of the sacroiliac joints
- Anti-CCP antibody testing
- Repeat plain radiograph
- CT scan of the sacroiliac joints
Show Solution
The Correct Option is A
Solution and Explanation
Step 1: Understanding the Question:
The clinical picture of a young patient with "inflammatory" back pain (improves with activity) and extra-articular manifestations like uveitis strongly suggests Axial Spondyloarthritis (AxSpA).
Step 2: Detailed Explanation:
Diagnosis Dilemma: In the early stages of AxSpA (like Ankylosing Spondylitis), plain X-rays are often normal. It takes years for visible bony changes like sacroiliitis or "bamboo spine" to appear.
Role of MRI: MRI is the most sensitive imaging modality for early AxSpA. It can detect "bone marrow edema" in the sacroiliac joints, which indicates active inflammation long before structural damage shows on X-ray or CT.
Spondyloarthritis Profile: These conditions are "seronegative," meaning tests for Rheumatoid Factor and Anti-CCP (Option B) will be negative.
CT vs. MRI: CT is excellent for bone detail but cannot see the active edema/inflammation that MRI can.
Treatment Significance: Early diagnosis via MRI allows for the early initiation of NSAIDs or Biologics (anti-TNF), which can prevent future joint fusion and disability.
Step 3: Final Answer:
When X-rays are normal but clinical suspicion is high for spondyloarthritis, an MRI of the SI joints is the definitive next step.
The clinical picture of a young patient with "inflammatory" back pain (improves with activity) and extra-articular manifestations like uveitis strongly suggests Axial Spondyloarthritis (AxSpA).
Step 2: Detailed Explanation:
Diagnosis Dilemma: In the early stages of AxSpA (like Ankylosing Spondylitis), plain X-rays are often normal. It takes years for visible bony changes like sacroiliitis or "bamboo spine" to appear.
Role of MRI: MRI is the most sensitive imaging modality for early AxSpA. It can detect "bone marrow edema" in the sacroiliac joints, which indicates active inflammation long before structural damage shows on X-ray or CT.
Spondyloarthritis Profile: These conditions are "seronegative," meaning tests for Rheumatoid Factor and Anti-CCP (Option B) will be negative.
CT vs. MRI: CT is excellent for bone detail but cannot see the active edema/inflammation that MRI can.
Treatment Significance: Early diagnosis via MRI allows for the early initiation of NSAIDs or Biologics (anti-TNF), which can prevent future joint fusion and disability.
Step 3: Final Answer:
When X-rays are normal but clinical suspicion is high for spondyloarthritis, an MRI of the SI joints is the definitive next step.
Was this answer helpful?
0
